High-pressure boiler



Feb. 17, 1931. w. A. J. KREAGER HIGH PRESSURE BOILER Original Filed June1, 1929 Patented Feb. 17, 1931 UNITED STATES PATENT OFFICE WILLIAM A. J.KREAGER, OF DENVER, COLORADO, ASSIGNOB, BY MESNE ASSIGN- MENTS, TOBARQUE ROYALTY, INCL, DENVER, COLORADO, A CORPORATION OF COLORADOIIIGH-PRE SSURE BOILER Application, filed June 1, 1929, Serial Thisinvention relates to improvements in boilers oi the type employed forthe production of steam under high pressure.

It is the object of this invention to produce '6 a high pressure steamboiler which is designed for use with gas or liquid fuel and which is soconstructed that it will give a very high thermal efliciency.

This invention briefly described consists of two cylindrical boilers,which are located one above the other and which are interconnected nearone end. The upper'boiler is provided with a cylindrical combustionchamber which is located substantially at its center or slight- 15 1ybelow the center and which is connected with one end of the boiler only.The inner end of the combustion chamber is provided with a header andthe interior of this header is connected with an annular header locatednear the front end of the boiler, by means of fines. The lower boilerhas its front end inwardly recessed and provided with a. large number offines which extend rearwardly and communicate with the interior of aheader 25 located a short distance from the rear end of the boiler. A.cover is provided for the recess in the front end of the lower boiler,and this is divided into two compartments by me ans of a transversepartition. The interior of the upper compartment is connected with theinterior of the annular header and the lower compartment is connectedwith a pipe leading to the outside of the building in which the boileris located.

Having thus briefly described the construction, the same will now bedescribed in detail, and for this purpose reference will be had to theaccompanying drawing in which the preferred embodiment ofthe inventionhas been illustrated, and in which:

Fig. l is a front elevation of the boiler;

Fig. 2 is avertical longitudinal section taken on line 22, Fig. 1; and VFig. 3 is a transverse section taken on line 3-3, Fig. 2.

In the drawing numeral 1 represents the upper boiler and numeral 2 thelower boiler. The lower boiler is supported from the fioor by means oftransverse bars 3 that extend between the vertical channels 4. Thesever- No. 367,664. Renews-(1.31113 3, 1930.

tic-a1 channels are connected and held together by means o1 bolts 5;Straps 6 extend between the upper ends of the vertical channels andserve as supporting means for the upper boiler. The upper and lowerboilers are both provided with flanged couplings 7. which affordscommunication between the in terior of the two boilers. The rear ends ofthe boilers are provided with bulged ends 9 that are riveted to thecylindrical portion in the usual manner. The front end of boiler 1 hassecured to it an end plate 10, whose out er edge is riveted to theoutwardly extend ing flange 11 of an angle iron, whose other flange 12is connected to the cylindrical portion 1. Plate has a central openingthrough which the cylindrical combustion chamber 13 extends and isconnected with the plate by being welded thereto. The

front end of member 10 is closed by means of n a plate 14 through whichthe burner 15 extends. The inner end of member 13 is provide-d with aheader 16 from which flues 17 extend forwardly and are connected withthe interior of the annular header 18 which, in this case, is formedintegral with the plate 10. The lower boiler is provided with a boilerhead 19 which is secured to the cylindrical portion of the boiler bymeans of rivet 20 in the manner described in connection with the upperboiler. The boiler head 19 is in wardly recessed as shown in Fig. 2 andis provided with a large number of openings in which are located flues21. The other ends of these fiues communicate with the interior of theheader 22. For the purpose of establishing communication between theannular header 18 and the lines 21, a conduit 23 has been provided. Thisconduit is welded from sheet steel and has a width somewhat less ihanthe diameter of the boiler as shown in *ig. 1. flanges 24: which areperforated for the reception of bolts by means of which it is secured inplace. An angle iron 25 extends transversely of the recessed boiler head19 and when the conduit 23 is in place, it serves as a support for thelatter and also as a partition wall. From Fig. 2, it will be seen thatthe interior of header 18 is in direct commu- This conduit is providedwith nication with the lines 21 that are located above the partition 2.A pressed sheet steel member 26 is secured at its upper edge to thedownwardly extending flange of the angle iron and has its edges securedto the boiler head 19 and serves to form a chamber 27 with which thelines below the angle 25 communicate. Chamber 27 is in communicationwith a flue outlet 28 through which the flue gases pass after they leavethe boiler. The feed water enters the boiler through openings in thebottom and for this purpose openings 29 and 30 have been provided,either or both of which may be used for introducing water into theboiler. The steam or hot water leaves the boiler at the top through oneof the openings 31.

The fuel is introduced under pressure and the gases of combustion afterleaving the combustion chamber travel through the line 17 into theheader l8 and pass thence downwardly through the conduit 23 and fromthence through the lines 21 that are located above the angle 25, intothe header 22 and from this header they pass through the fines 551located below the angle 25 to the chamber 27 from which they areconducted to the outside of the building by means of a suitable pipeconnected with 28. The water which is introduced at the bottom flowsupwardly be tween the flues 21 and passes throu i the opening 32 intothe upper boiler where it comes into contact with the hot surfaces ofthe combustion chamber a d the fines 11'. It is evident that as the fluegasespass downwardly from the combustion chamber to the discharge pipe28, they will gradually decrease in temperature as they a c continuallygiving up their heat to the wet r with which they are surrounded. As thefeed water is coldest where it enters the boile* its temperature willgradually increase as it flows upwardly and it moves upwar: it comesinto contact with surfaces that are of increasingly greatertemperatures, so that a substantizlly uniform temperature gradient 1sestablished between the water and the heated surfa 'es. W hen the boileris in operation and the supply of feed water has been adjusted so as tocorrespond with the water evaporated, parts will soon reach a state inwhich the ten'i peratures at different parts of the boiler will remainsubstantially constant, and therefore there will be no sudden anddrastic changes with corresponding expansions and contractions which upsevere strains in the boiler.

The boiler constructed in the manner above described can be covered withheat insulating material so as to reduce the neat los es due toradiation, anc since the combusti n chamber and the lines are entirelysurrounded by water, the transfer of heat from the fines to the water isvery complete and therefore a high thermal efficiency is obtained. Dueto the fact that the line gases pass downwardly and emerge from theboiler below the combustion chamber, the feed water can be admittedclose to the point where the flue gases escape and therefore as thewater increases in temperature and rises, it will continually come intocontact with surf res that are hotter and in this manner a moreeiiicient heat transfer is obtained than if the flue gases left theboiler near its top in the usual manner.

Having thus describet the invention what is claimed as new is:

1. A high pressure steam generator com prising two cylindrical memberslocated above each other, means for connecting the interiors of themembers, a cylindrical combustion chamber located in the upper member,the inner end of the comlmstion chamber terminating in a header, aheader enclosing the front end of the combustion chamber, fluesconnecting the headers. a header near each end of the lower cylindricalmember, a plurality of fines connecting the interiors of the last namedheaders, the front header in the lower cylindrical member having twocompartments, means for connecting one of said compartments with theinterior of the header enclosing the front end of the combustion chamberand means for connecting the other compartment with the atmosphere.

2. A high pressure steam generator comprising two cylindrical boilers,means for supporting them in superposed relation, mean? for connectingthe interiors of the boilers, a cylindrical member extending inwardlythrough tne front end of the upper member and terminating adjacent therear end thereof, said last named member forming a combustion chamber, aheader carried by the inner end of the last named cylindricalmember,aheader surrounding the combustion chamber near the front endthereof, a plurality of fines connecting the headers, the front end ofthe lower boiler having a recess, a cover for the recess, means fordividing the recess into two compartments, means for connecting one ofthe compartments with the interior of the header surrounding the frontend of the combustion chamber, means for connecting the interior of theother compartment with the atmosphere, a header located in the lowerboiler adjacent the rear end thereof and a plurality of flues connectingthe interiors of the two compartments with the last named header.

3. A high pressure steam generator consisting of two cylindrical boilerslocated one above the other, means for supporting the boilers, means forconnecting the interiors of the boilers, a cylindrical member of smallerdiameter than the upper boiler extending inwardly from one end thereof,said member forming a combustion chamber, a header secured to the innerend of the combustion chamber, another header located near the front endof the combustion chamber, fines kill connecting the two headers,aplurality of fines extending inwardly from the front end of the lowerboiler, a header in the rear end of the lower boiler, the flues havingtheir rear ends connected with the last named header, a cover for thefront end of the lower boiler, said cover when in place forming achamber, means for dividing the chamber into two compartments, means forconnecting one of said compartments with the header near the front endof the combustion chamber and means for connecting the other compartmentwith the atmosphere.

4. A high pressure steam generator comprising two boilers adjacent eachother, means for connecting the interiors of the boilers, a hollowmember forming a combustion chamber located in one of said boilers, therear end of the combustion chamber terminating in a header, a headerenclosing the front end of the combustion chamber, fines con necting theheaders, a header near each end of the other boiler, a plurality offines connecting the interior of the last named headers, the frontheader in the last named boiler having two compartments, means forconnecting one of said compartments with the interior of the headerenclosing the front end of the combustion chamber and means forconnecting the other compartment with the atmosphere.

5. A high pressure steam generator comprising two boilers, means forinterconnecting the interiors of the boilers at two spaced points, ahollow member extending inwardly through the front end of one of theboilers and terminating adjacent the rear end thereof, said last namedmember forming a combustion chamber, a header carried by the inner endof the combustion chamber, a header enclosing thecombustion chamber nearits front end, a plurality of fiues connecting the headers, the frontend of the other boiler having a recess, a cover for the recess, meansfor dividing the recess into two compartments, means for connecting oneof the compartments with the interior of the header near the front endof the combustion chamber, means for connecting the interior of theother compartment with the'atmosphere, a header located in the secondboiler adjacent the end opposite from the recess, and a plurality offlues connecting the interiors of the two compartments of the recesswith the last named header.

6. A high pressure steam generator consisting of two boilers locatedadjacent each other, means for supporting the boilers, means forconnecting the interiors of the boilers, a hollow member extendinginwardly from the front end of one of the boilers, said member forming acombustion chamber, a header secured to the inner end of the hollowmember and in communication with the coinbustion chamber, another headerlocated near the front end of the combustion chamber, fines connectingthe two headers, a plurality of fiues extending inwardly from the frontend of the other boiler, a header in the rear end of the lastnamedboiler, the flues having their rear ends connected with the last namedheader, a cover for the front end of the last named boiler, said coverwhen in place forming a chamber, means for dividing the chamher into twocompartments, means for connecting one of said compartments with theheader near the front end of the combustion chamber and means forconnecting the other compartment with the atmosphere.

In testimony whereof I afiix my signature.

WILLIAM A. KREAGER.

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